Alarm attachment for incubators.



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ALARM ATTACHMENT FDR INCUBATORS.

(Application led Mayll, 1901.)

(No Model.)

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UNITED STATES PATENT OEEIcE.

ROBERT Il. STEVENSON, JR., OF WESTERN SPRINGS, ILLINOIS.

ALARM ATTACHMENT FOR INCUBATORS.

SPECIFICATION forming part of Letters Patent No. 695,245, dated March11, 1902.

Application tiled May 4, 1901. Serial No. 58,796. (lio model.)

T0 @ZZ whom t may concern:

Be it known that 1, Ronnnr H. SrnvENsoN, J r., a citizen ot' the UnitedStates, residing at NVestern Springs, in the county et Oooh and State ofIllinois, have invented new and useful Improvements in Alarm Attachmentsfor Incubators, of which the following is a specification.

This invention relates to incubaters, and has for its object to providea simple electric alarm in the nature of an attachment for incubatore otordinary construction and adapted to indicate audibly whenever thetemperature rises or falls to an extent which will be dangerous orinjurious to the contents of the incubator.

Other objects of the invention will appear in the course of thesubjoined description.

The invention consists in an alarm attachment for incubators embodyingcertain novel features and details of construction and arrangement ofparts, as hereinafter fully described, illustrated, and claimed.

In the accompanying drawings, Figure 1 is a side elevation of anincubator, showing an electrical alarm attachment applied thereto. Fig.2 is a detail perspective View of the block, forming part of theattachment and carrying the contact-points and terminal conductors.

Similar numerals of reference designate corresponding parts in bothfigures ot the drawings.

Referring to the drawings, 1 designates the body of an ordinaryincubator; 2, the heater; 3, the chimney or flue which communicates withthe interior of the incubator-body, and i the damper-arm or balance-rod,which is mounted at a point intermediate its ends upon a fulcrum-post 5and provided at one end with a damper 6 and at its opposite end with acounterbalance-weight 7, the said parts being of theordinaryconstruction and arrangement.

In carrying out the present invention I provide a suitable block or base8, containing a pair of terminal conductors 9 in the form of rods orwires bent into substantially U shape, as indicated in Fig. 2, andhaving their extremities projecting outside of the block and bentupward, as shown at 10, the said extremities being provided withsuitable contact-points 11 and 12, arranged in substantially the samehorizontal plane and in pairs at or near each end of the block S.Circuitwires 13 connect the terminals 9, respectively, with a battery laand alarm-bell15, which are for convenience mounted on the top of theincubator-body, as illustrated in Fig. 1.

The balance-rod et is provided with a pair of circuit-closers or bridges1G in the form of metal plates secured to the lower side of thebalance-rod at suitable points to come in contact with thecontact-points 11 and 12 as the balance-rod is tilted in one directionor the other.

In operation as the temperature rises or falls to a point which isordinarily dangerous or injurious to the eggs the balance-rod 4,iniiuenced by the usual thermostat, (not shown,) will tilt in onedirection or the other, thereby bringing one ot the contact-makersorbridges 16 into engagement with the pair ot contacts 12 or the pair ctcontacts 11, according to the direction in which the balance-rod tilts.Under either extreme movement of the balancerod 4E it will therefore beapparent that the circuit containing the alarm-bell will be closed,thereby audibly indicating that the heater of the incubator needsattention. By the arrangement disclosed the alarm will be sounded whenthe temperature rises too high or falls too low or in case the llame ofthe heater should be accidentally blown out or otherwise interferedwith.

It will be understood that the alarm attachment hereinabove described isapplicable to incubatore already on the market and in use and that thesaid attachment does not necessarily form a part ot' the originalconstruction of the incubator. It will also be understood that thedevice is susceptible of changes in the form, proportion, and minordetails of construction, which may be accordingly resorted to withoutdeparting from the principle or sacrificing any of the advantages of theinvention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

In an alarm attachment for incubators, the combination with thebalance-rod ot the thermostat, said rod being arranged exterierly of IOOthe incubator-casing and fuiorumed thereon l both sets ofvcontact-plates and the electrieai x intermediate its ends, of aplurality of circuit-@losers carried by said rod at opposite sides ofthefu1crum,two sets of contact-points arranged at opposite sides of thefulerurn of the balance-rod in the path of movement of thecircuit-@losers and in an electric alarmcircuit, and an attaching-blockapplied to the incubator-Casing and forming a support for conductorstherefor. v In testimony whereof I aiiix my signature in presence of twoWitnesses.

ROBERT H. STEVENSON, JR.

Witnesses:

CLARENCE V. BROCKWAY, JOEL W. DIoKINsoN.

